One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10)(11,19)(12,17)(13,15)(14,18)(16,20)(21,22)(23,24)(25,26,30,31)(27,29,34,32)(28,36,38,33)(35,39,40,37)(3,7)(6,8)(11,20)(12,21)(16,19)(17,22)(26,31)(27,34)(33,36)(35,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11,15,20)(10,16,13,19)(12,14,21,24)(17,23,22,18)(25,26)(27,32)(28,33)(29,34)(30,31)(35,39)(36,38)(37,40)(1,3)(2,6)(4,7)(5,8)(9,12)(10,17)(11,14)(13,22)(15,21)(16,23)(18,19)(20,24)(25,27,30,34)(26,32,31,29)(28,35,38,40)(33,39,36,37)(1,2)(3,6)(4,5)(7,8)(9,13,15,10)(11,16,20,19)(12,22,21,17)(14,23,24,18)(25,28,30,38)(26,33,31,36)(27,35,34,40)(29,37,32,39)(9,14)(10,18)(11,21)(12,20)(13,23)(15,24)(16,17)(19,22)(25,29,30,32)(26,34,31,27)(28,37,38,39)(33,40,36,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.